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Temperature History Indicator

a technology of temperature history and indicator, which is applied in the direction of chemical indicators, instruments, chemical methods analysis, etc., can solve the problems of low temperature history indicators that are inferior in visibility for temperature history, liquid leakage may occur, etc., and achieve low cost, easy detection of temperature history, and easy control of goods

Inactive Publication Date: 2008-03-20
POWDERTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a temperature history indicator that can securely and easily control the temperature history of individual goods refrigerated and preserved under various temperature conditions. The indicator is a low-cost solution that can detect the temperature history of the goods and prevent them from quality deterioration. The indicator is easy to use, secure, and safe. It can be used in various fields such as drugs and medical supplies, printing inks and electricity, machinery and appliances, and fresh meats. The indicator is made up of an oxygen detecting agent and a slightly gas-permeable packaging film. The packaging film has an oxygen permeability of 0.1 to 50 ml / m2.day at a temperature of 25°C. The indicator detects the temperature history of the goods by changing color in response to the oxygen concentration. The color change is irreversible and can be easily controlled. The method of controlling the temperature history of the goods involves using the temperature history indicator and a color sample that shows the relationship between temperature and change in color tone with time.

Problems solved by technology

Therefore, there are such problems that the liquid leakage may be likely to occur depending on the handling manner of the indicators; the leaked liquid adheres to foods and the like for which the low temperature history has to be controlled and is likely to contaminate them; and the low temperature history indicators are inferior in visibility for the temperature history in the range of −20° C. to 0° C.

Method used

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Examples

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examples

Preparation Examples

[0106] Hereinafter, suitable examples and comparative examples of a temperature history indicator according to the present invention will be specifically explained further with reference to preparation examples 1 to 9, but the present invention is not limited by these preparation examples.

preparation example 1

[0107] [Temperature History Indicator (No. 5)>

[0108]20>

[0109] An oxygen detecting agent main body 20 was prepared in accordance with examples 3 and 4 of Japanese Patent Laid-Open Publication No S63-243754.

[0110] That is, a mixed solution was prepared by mixing 13 parts by weight of a 0.5% methylene blue solution, 13 parts by weight of a 0.25% Safranine T solution, 65 parts by weight of 30% D-glucose and 9 parts by weight of a 15% potassium hydroxide solution and the resulting mixed solution was impregnated in a filter paper (“example 3” in the same patent application). In addition, thereafter, the filter paper was vacuum dried to remove the unnecessary moisture where necessary (“example 4” in the same patent publication).

[0111] The oxygen detecting agent main body 20 described in example 4 of this patent publication changed in color to pink when it was maintained under a nitrogen atmosphere (the oxygen concentration: not more than 0.1%) and developed a blue color when oxygen of mo...

preparation example 2

[0125] [Temperature History Indicator (No. 7)>

[0126] A temperature history indicator was prepared similarly to preparation example 1 except that the following biaxially stretched polyamide (ONY 15) / polyacrylonitrile (PAN) laminated film (D) was used as the packaging film 30 in preparation example 1 and was tested in a similar way.

[0127] The results are shown in FIG. 3-1 and FIG. 3-2.

[0128] The details of preparation example 2 are as follows.

[0129]20>

[0130] The oxygen detecting agent main body 20 was prepared in accordance with examples 3 and 4 of Japanese Patent Laid-Open Publication No. S63-243754.

[0131] That is, a mixed solution was prepared by mixing 13 parts by weight of a 0.5% methylene blue solution, 13 parts by weight of a 0.25% Safranine T solution, 65 parts by weight of 30% D-glucose and 9 parts by weight of a 15% potassium hydroxide solution and the resulting mixed solution was impregnated in a filter paper (“example 3” in the same patent publication). In addition, the...

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Abstract

A temperature history indicator equipped with an oxygen detecting agent main body which changes in color in response to the oxygen concentration and a slightly gas-permeable packaging film for sealing and coating said oxygen detecting agent main body. The packaging film is a laminated film of two or more kinds of films including any of polymers selected from polyethylene terephthalate (PET), polyacrylonitrile (PAN), polyamide (NY) and polyethylene (PE). A temperature history indicator set equipped with the temperature history indicator and color sample showing the relationship between a temperature and a color tone change with time is also provided. A method of controlling a temperature history of goods by using the above-mentioned indicator is also disclosed.

Description

BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to a temperature history indicator, more particularly to a temperature history indicator capable of controlling the quality of fresh foods and the like freshly, conveniently and securely at a predetermined temperature in the range of −10° C. to +10° C. which is a refrigeration range of foods, drugs and various machinery and appliances, and a temperature history indicator set using the temperature history indicator as well as a method of controlling a temperature history of goods using them. [0003] 2. Description of the Related Art [0004] In recent years, in the fields of drugs and medical supplies, printing inks and electricity, machinery and appliances in addition to the field of foods, some goods are transported, preserved (stored) and processed in a frozen or refrigerated state or at a chilled temperature (that is, a temperature of more than 0° C. to approximately +5° C.) or further ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): G01N21/78G01N21/75
CPCG01N31/229G01N21/783
Inventor KODAMA, RYUICHI
Owner POWDERTECH
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